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		<a class="header-logo header-affix-hide margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Usaco2005 mar]Yogurt factory 奶酪工厂</a>
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                [Usaco2005 mar]Yogurt factory 奶酪工厂                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">The cows have purchased a yogurt factory that makes world-famous Yucky Yogurt. Over the next N (1 &lt;= N &lt;= 10,000) weeks, the price of milk and labor will fluctuate weekly such that it will cost the company C_i (1 &lt;= C_i &lt;= 5,000) cents to produce one unit of yogurt in week i. Yucky's factory, being well-designed, can produce arbitrarily many units of yogurt each week. Yucky Yogurt owns a warehouse that can store unused yogurt at a constant fee of S (1 &lt;= S &lt;= 100) cents per unit of yogurt per week. Fortuitously, yogurt does not spoil. Yucky Yogurt's warehouse is enormous, so it can hold arbitrarily many units of yogurt. Yucky wants to find a way to make weekly deliveries of Y_i (0 &lt;= Y_i &lt;= 10,000) units of yogurt to its clientele (Y_i is the delivery quantity in week i). Help Yucky minimize its costs over the entire N-week period. Yogurt produced in week i, as well as any yogurt already in storage, can be used to meet Yucky's demand for that week. </span></p>
<div><span style="font-size: medium">&nbsp;牛们收购了一个奶酪工厂,接下来的N个星期里，牛奶价格和劳力价格不断起伏．第i周，生产一个单位奶酪需要Ci(1&le;Ci&le;5000)便士．工厂有一个货栈，保存一单位奶酪，每周需要S(1&le;S&le;100)便士，这个费用不会变化．货栈十分强大，可以存无限量的奶酪，而且保证它们不变质．工厂接到订单，在第i周需要交付Yi(0&le;Yi&le;104)单位的奶酪给委托人．第i周刚生产的奶酪，以及之前的存货，都可以作为产品交付．请帮牛们计算这段时间里完成任务的最小代价．</span></div></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">* Line 1: Two space-separated integers, N and S. </span></p>
<p><span style="font-size: medium">* Lines 2..N+1: Line i+1 contains two space-separated integers: C_i and Y_i.</span></p>
<div><span style="font-size: medium">&nbsp;</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第1行输入两个整数N和S．接下来N行输入Ci和Yi．</span></div>
<p></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">* Line 1: Line 1 contains a single integer: the minimum total cost to satisfy the yogurt schedule. Note that the total might be too large for a 32-bit integer. </span></p>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;输出最少的代价．注意，可能超过32位长整型．</span></div></p><hr/><h3>样例输入</h3><pre>4 5
88 200
89 400
97 300
91 500

</pre><hr/><h3>样例输出</h3><pre>126900

第1周生产200单位奶酪并全部交付；第2周生产700单位，交付400单位，有300单位；第3周交
付300单位存货．第4周生产并交付500单位．
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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